A particle of mass \( m \) at rest is acted upon by a force \( F \)...

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A particle of mass \( m \) at rest is acted upon by a force \( F \) for a time \( t \). Its kinetic energy after an interval \( t \) is :
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(1) \( \frac{F^{2} t^{2}}{m} \)
(2) \( \frac{F^{2} t^{2}}{2 m} \)
(3) \( \frac{F^{2} t^{2}}{3 m} \)
(4) \( \frac{\mathrm{Ft}}{2 \mathrm{~m}} \)
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